FP31QF Datasheet, PDF (10/13 Pages) WJ Communication. Inc. – 2-Watt HFET

FP31QF
2-Watt HFET
The Communications Edge ^TM
Product Information
Reference Design: 3500 MHz
The application circuit is matched for output power.
Typical RF Performance
Drain Bias = +9 V, I_ds = 450 mA, 25°C
Frequency
MHz 3500
S21 – Gain
dB 11.9
S11 – Input Return Loss
dB -16
S22 – Output Return Loss dB -8.8
Output P1dB
dBm +33.5
Output IP3
(+18 dBm / tone, 1 MHz spacing)
dBm +45
The 3.5 GHz Reference Circuit is shown for design purposes only. An
evaluation board is not readily available for this application. The reader can
obtain any FP31QF evaluation board and modify it with the circuit shown to
achieve the performance shown in this reference design.
Measured S-Parameters
15
10
5
0
DB(|S[1,1]|)
DB(|S[2,1]|)
DB(|S[2,2]|)
-5
-10
-15
-20
-25
3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7
Frequency (GHz)
C3
C2
Circuit Board Material: .014” FR-4 (ε_r = 4.6),
4 layers (other layers added for rigidity), .062” total thickness, 1 oz copper
The main microstrip line has a line impedance of 50 Ω.
Ref. Desig.
C1, C4, C8, C10
C2
C3
C6, C11
C7
C12
L1, L2
L3
R1
R2
Q1
C5
Bill of Materials
Value
Part style
22 pF
Chip capacitor
0.9 pF
Chip capacitor
1.0 pF
Chip capacitor
0.018 µF Chip capacitor
1000 pF Chip capacitor
0.1 µF
Chip capacitor
6.8 nH
Wirewound chip inductor
3.3 nH
Multilayer chip inductor
2.2 Ω
Chip resistor
50 Ω
Chip resistor
FP31QF WJ 2W HFET
Do Not Place
Size
0603
0603
0603
0805
0603
1206
0805
0603
0603
0603
QFN 6x6
• Both the C2 and C3 placements are between the first and second via locations
along the main microstrip line leading from the FP31QF device. Further
descriptions are shown in the diagram on the left.
• The via hole spacing along the main microstrip line is .040”.
• The distance from the edge of the FP31QF to the closer edge of L3 is .305”.
• The transmission line lengths shown in the schematic are from the FP31QF
device edge to the component edge.
CA P
CAP
CA P
ID=C6 ID =C7
ID=C8
C=2 2 pF C =100 0 pF C=1.8e 4 pF
-Vgg Vds=9V @ 450 mA
P ORT
P =1
Z=50 Ohm
CAP
ID=C1
C=2 2 pF
IND
ID=L3
L =3.3 nH
TL INP
ID=TL1
Z0 =50 O hm
L =30 mil
Eeff=3.46
Loss=0
F0 =0 MHz
RES
I D=R1
R =2.2 O hm
CAP
ID=C2
C=0.9 pF
RES
ID=R2
R=51 Ohm
CAP
ID=C5
C=DNP pF
IND
ID=L1
L =6.8 nH
2
1
SUB CKT
ID=Q1
NET="FP31QF"
IND
ID=L2
L =6.8 nH
TL INP
ID=TL2
Z0 =50 Ohm
L =65 mil
Eeff=3 .46
Loss=0
F0 =0 MHz
CAP
ID=C12
C=1e 5 pF
CAP
ID=C11
C=1.8e 4 pF
CAP
ID =C10
C =2 2 pF
CAP
ID=C4
C=2 2 pF
P ORT
P =2
Z=50 Ohm
CAP
ID=C3
C=1 pF
Specifications and information are subject to change without notice
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: [phone] • e-mail: [e-mail] • Web site: www.wj.com
November 2004